Door latch oscillatable in either of two planes for opening



March 10, 1959 A. J. SCHULZ ET-AL 2,877,036 .DOOR LATCH OSCILLATABLE IN EITHER OF TWO PLANES FOR OPENING 2 Sheets-Sheet 1 Filed Oct. 12. 1955 JNVENTORS AMA-e o J. .5 c1104 2 Dawn/.0 A 50/0421 March 10, 1959 sc u z ETAL $2,877,036

A.. DOOR LATCH OSCILLATABLE IN EITHER OF TWO 2 Sheets-Sheet 2 PLANES FOR OPENING Filed Oct. 12, 1955 INVENTORS Auk-2:0 J. SCI-{0L2 Dan/44.0 A. 50/04. z

ATTORNEY! bOOR LATCH OSCILLATABLE IN EITHER OF TWO PLANES FOR OPENING Alfred J. Schulz and Donald A. Schulz, Milwaukee, Wis., assignors to S-B Manufacturing Company, Wauwatosa, Wis., a partnership of Wisconsin Application October 12, 1955, Serial No. 539,992

23 Claims. (Cl. 292-450) This invention relates to a door latch oscillatable in either of two planes for opening.

Our improved latch uses a desirable construction in which the operating lever is integral with two handles exposed at the respective sides of the door. In order to release such a latch in the construction heretofore known, it has been necessary to push the handle at one side of the door or pull the handle at the other side. In either case, the efiect is to pivot the handle lever about a pintle on a vertical axis to disengage a retaining jaw from a jamb-mounted striker plate. Because many persons used to a turnablc latch are confused by a push-pull latch, the present device is made to operate both ways. It will rotate about a horizontal axis in addition to oscillation on the vertical axis above described, whereby any one of a number of manipulations of the handle will effect a door-opening release of the dog.

In order to give effect to these objectives, the generally upright pintle upon which the handle lever is pivoted is not fixed to the escutcheon plate which mounts the latch structure on the door, but is fixed to a sleeve rotatably mounted in a bearing which extends through the door from the escutcheon plate at one side thereof. The spring which biases the lever toward latch-engaging position is also mounted in the'interior of this oscillatable sleeve. The striker plate mounted on the iamb is limited in length to coincide substantially with the yieldable dog of the handle lever so that in the normal position of the handle lever the dog and the striker plate will interact to latch the door in its closed position. However, any movement of the handle lever about either of its two axes of rotation will disengage the dog from the striker plate to permit the door to be opened.

. A double-ended spring connected between the mounting plate and the rotatable sleeve aforesaid is permanently under torsion and the arrangement is such that oscillation of the sleeve in either direction will pick up one end of the spring from its anchorage on the mounting plate, thereby subjecting the sleeve to bias for returning it back to its normal position regardless of the direction in which it has been oscillated by the operators manipulation of the handles.

Other features of the invention include a novel torsion spring anchorage; and novel-arrangements of the door locking slide and a separate slide which moves with the handle lever to close the escutcheon plate opening against ingress of moisture or insects.

Still another feature of the invention is the novel construction and mounting of a dog which has a sliding fit in the member which provides the handles and the handle lever.

. In the drawings:

Fig. 1 is a sectional view taken generally on the line 1-1 of Fig. 2.

Fig. 2 is a view in section taken generally on the line 22 of Fig. 1.

Fig. 3 is a view in section taken generally on the line H. of Fig. 1.

ice

Fig. 4 is a view of the latch mechanism as viewed from the side and the rear of the mounting plate, the handle being broken away in transverse section.

Fig. 5 is a view in section taken generally on the line 5-5 of Fig. 1.

Fig. 6 is a view in perspective showing the entire door-mounted portion of the latch as viewed from the inner side, the external escutcheon plate being omitted.

Fig. 7 is a view in perspective of the inner side of the inner mounting plate, the inner escutcheon or trim plate being omitted and the handle lever being broken away at both ends.

Fig. 8 is a detail view in perspective of the separated parts shown in Fig. 7 as viewed from the outside end of the bearing sleeve, the handle lever being omitted completely.

Fig. 9 is a view in perspective illustrating separately the slides for latching and insect exclusion which are mounted in the inner escutcheon plate, the latter being also illustrated in perspective.

Fig. 10 is a view taken in cross section on the line- 10-10 of Fig. 1.

slidable in the handle lever.

Fig. 12 is a fragmentary detail view taken in the plane of Fig. l and illustrating the operation involved in the assembly of the dog and lever.

The door 15 will be understood to represent the usual screen, storm, or combination door having hinges (not shown) at the remote side of the door opening. The free side margin 16 of the door seats in the usual manner against shoulder 17 of the door jamb 18. The strikerplate 19 has a flange 20 screwed to the jamb, the striker 19 projecting to be engaged by a dog slide 21 guided by handle lever 22 and projected-outwardly by the bias of spring 23.

The light pressure of spring 23 and the inertia and friction involved in the yielding of the dog 21 in its bearing socket 24 in handle lever 22 is the only resistance which must be overcome to enable the dog to clear the strike plate in the closing movement of the door. It is unnecessary for the handle lever 22 to oscillate about its mounting pintle 25 as the door closes.

The handle lever 22 projects through the door and carries handle 26 inside the door and handle 27 exteriorly of the door. The pintle 25 has a normally up right axis and is engaged at its ends in a sleeve 28 rotatably oscillatable in a bearing tube 29 which, as best shown in Figs. 7 and 8, may be formed integrally with a mounting plate 30 riveted or otherwise secured to the interior escutcheon plate 31 and held by screws 32 to the inner face of the door.

from the sleeve 28 comprises a second and separate bearing means which supports the handle lever for oscillation about an axis transverse respecting the first axis and remote from plate-31.

The rotatably oscillatable sleeve 28 is prevented from moving outwardly in the bearing tube 29 by means of integral stop lugs 34 at the outer end of tube 29. These lugs further serve to limit the oscillation of sleeve 28, being disposed in the path of the integral lug 33 on the outer end of sleeve 28 as best shown in Figs. 4 and 8.

The sleeve 28 is maintained normally centered in the J relative position shown in Fig. 4 by a torsion spring 35 which has: hooked ends 36 and 37- Iespectively engagedgar-mas atoppositesidesof thenormally registering hooks 39 and 40 with which the oscillatably rotatable sleeve 28 and the bearing tube 29 are respectively provided at their inner margins. Each of'these. hooks is desirably slightly inclined helically to provide one spring seat at 41 near its outer end and another. spring seat at 42 near its base. With the hookedends 36 and. 37 engaged in the registering spring seats 41 and the registering spring seats42, re spectively, it will be apparent that any rotative movement of sleeve 28 in either direction from its normal centered position of oscillation will pick up one of the hooked ends ot'thetorsionspring 35 to subject the spring to increased bias tending to restore the sleeve 28 to the initial position. In cons equence, the .operator;can manipulate either of the handles 26 or 27 to oscillate the handle lever 22 either clQGkWise.or'counterclockwisefrom its normal, centered position and thereby tooscillate-thedog 21 free of engagement with thestrike-plate 19 for theopeningof the door, the oscillation required for door opening storing up additionaltorsion in spring .35 sufiicient to restore the sleeve and handle to. centerediposition. as soon as rotative pressure on the handle .26 or 27 isreleased.

It is also possible to release-dog 21 from. striker plate engagement by pivoting the handle-lever. on its pintle 25 as a result either of an outward pull on handle 27 or. an outward push on handle26. This movement of the handle is resisted by a compression spring 44 for which a seat isprovided against strap 45 in the side wall. of the mountingsleeve 28.- Due to, the cylindrical. curvature of this side wall, the flat endofthe spring is accommodated at each side of strap 45 in the notches 46 and 47 formed by cutting away material to-define the strap. See Figs. and 8-. The handle lever has an annular socket at 49cut aroundflstudSOto provide a seat for the end of spring 44 where the latter engages the lever as best shown in Figs. 1 and 5. Thus, the spring 44 rotates with the handle lever audits mounting sleeve .28 whenthe latch. structure ispivoted-onthe axisof said; sleeve. When the handle lever and latch dog are pivoted on the axis of pintle 25, the sleeve is stationary and the pivotal movement increases the bias .of spring 44, whereby the handle lever is returned to-the position of ;Fig. 1 upon'release of the handle which has-been manipulated by the operator.

The escutcheon plate 31 at .the inside of the doorhas an opening 51 of.sufficient size to accommodate the rotation of the handle-lever with sleeve 28 and the bodily lateral oscillation of the handle lever about pintle 25. To exclude insects, this openingSl is closedby a. sliding plate 52Which:.has an inwardly projectingfiange at 53 embracing the handle lever in the mannerxbest shown in Figs. 2 and 6, the flange extending into the opening 51 and protecting the handle lever. from being abraded or cut bythe-edgeof the escutcheon plate about such opening.

For locking the door, the slide 55 is provided. In order that this slide may move only when manually operated, it is desirably arched slightly as best shown in Fig. 9, and theflanges 56, 57 at its upper and lower margins ride on the reenforcing hosses-59 of the mounting plate 3t),v as best shown in Fig. 2. The slide55 has an operating tab 60 which projects laterally through a slot 61 in the side wall of escutcheon plate .31 and desirably carries, externallyof the escutcheon plate, a button-shaped rivet 62'to facilitateits manipulation. See Figs. 1 to 3 and 9.

A port cut in slide SS-is Lashaped as best shown inFig. 3 and Fig. 9. Arelatively wide part 64 0f the slot permits free lateral swinging movement of lever 22 about pintle-ZS-for the disengagement of thelatch dog 21 from st-rikerplate '19,whenthe slide-is'in the position shown in Fig; 3. The slot oropeningin the slide is also notched away -at=.65 to accommodate oscillation of the lever 22 uponithe axis-of sleeve. 28 for the-release of the dog 21 from striker.p1'ate..19 .when thisamode of operation .is

desired.

Howeven; ifrthe -s1ide is 1 manipulated: upwardly as viewedn'n Eig;:3,: the anal-rower :portion 66:of:its-.:slot .will. 7

4. register with lever 22.. Since the margins. otthe slidewill then closely confine the lever, it will be evident that with the parts in this position the lever cannot oscillate either upon pintle 25 or upon the axis of sleeve 28 and the door will thereby be locked. The resilient bias of the slide 55 toward the convex fornr which it assumes when free, as shown in Fig, 9, will maintain theslide in. any position to which it is manually adjusted. In. its extreme positions,- it is further retained by engagement of its respective flanges 56 or 57 over the embossed portionsv 59 otthe mounting plate 30'upon'whichsuch. flanges normally bear (see Fig. 2).

The bearing socket 24 formed in the enlargement 69 of the assembled lever 22 may very conveniently b'e'made in the die casting of the.handle.lever,. this being the preferred method of construction. The dog 21 may be made in one piece by a stamping operation as best shown in Fig. ll. It has a beveled. end.70. and'vertical sidewalls 71. The rear wall 72 is foldedifrom. the. inner. marginvofi the end wall. 70,v While the-outer wall. comprises flanges 73, 74 *folded integrally-fromthe sides. 71.

The'opposing sides have registering sl0ts75 to receive apin 76 which extends across the socket 24:. and serves to guide as well as to limit the movement of thedoga Antother pin at 77 has its ends; anchored in the-registering holes 78 in the sides 71 of the dog. This. pin.7.7is:re+- ceived within the coil. of the torsion spring 23.. Onezleg: 79 of this spring seats. against pin 76. The.:otherl'eg.80. 8f the spring seats against the inclined end wall 70 ofgthe The dog is intentionallyprovided.with an. opening-at 85 of sufiicient size to receive the spring and a. tool 86 Which is usedto manipulate the spring into position;

The tool 86 simply comprises a tube'which is. flattened at 87 to make it wider and thinner at this endfor the reception of both legs 79 and of the spring 23,.

whereby the spring is held in'the end of the. tool during its manipulation into position. With the spring so held,

thetool is inserted in the manner shown inFig. 12until: the coil portion'of the spring, registers with. the holes '78 in the dog, whereupon the pin 77is insertedthrough the spring coil to anchor the spring in the dog; De-- s1rably,.the spring tool.86 is allowed to remaininplace:

in the aperture of the dog until the dog has. beeninserted in the bearing socket 24' of the handle. lever. and the pin 76 has been inserted through theslots..75;

of the dog'and upset or otherwise fastened to thehandle; lever to maintainthe assembly. The tool isrthemwith-r drawn, allowing the'leg 79 and spring to movefrom ther position of Fig. 12 to the position of'Fig. 1, whereupon".

the dog is biased outwardly to the limit defined. by the pin 76 and slides freely inwardly against the biaszof: the

spring.

The outer escutcheonxplate 9.0 has. an opening: at 91i which need onlybe suflicientizrsize to accommodate the relatively slight oscillatory movement of: lever: 22' The oscillation upon' the: axis of sleeve 28 is, of course, .substantially 180.", but the oscillation laterally on pintle 25 is relatively: slight which occurs at this point.

because of the proximity of. the pintle tothis: openingin a door. of normal thickness.

door, the. device can be.xmounted.:on;doorsofany usual thickness. within the; range-.of. stock sizes.

Because the .deviceof the presentinvention. permits .the door to be opened either by the rotation of the handle;

or by its movement outwardly, it is well adaptedato the convenience of persons who are accustomed". to theitvro well-known difierent types of latch mechanismguthe one.

handle lever will release the latch, neither of-.suchl'oscil-'.-i

The plate9ll performsmoi. function but is used solely to enhance. theappearance; of the installation at-the-outside of the door; Because: the structure is supported entirelyyfromthe inside. of;ther

latory movements is required for the engagement of the latch. As the door closes, the striker plate earns the inclined end face 70 of the dog 21 to slide the dog rearwardly into its socket 24 against the bias of spring 23 until the end of the dog clears the striker plate 19, whereupon the dog springs outwardly to the position of spring 23. A feature of the device which may not immediately be apparent is the fact that in the latched position in which the parts are shown in Fig. 1, the lever 22 is not at right angles to the door but extends from its fulcrum 25 obliquely toward the jamb. This causes the free end margin of the end wall 70 of the dog to engage the striker plate with a hooked action which, in the event of pressure outwardly on the door, tends to engage the dog more snugly with the striker plate instead of camming it toward a releasing position; To aid in such action, the striker plate may be slightly hooked as shown in Fig. 1.

We claim:

1. In a door latch structure, the combination with a mounting member for attachment to a door, of a handle lever adapted to extend through a door, a first handle on the lever at the end thereof nearest the mounting member, a second handle at the other end of the lever, a latch dog supported from the lever and projecting laterally adjacent the first handle, first bearing means for supporting the lever for oscillation about an axis which extends longitudinally of said lever portion, and second and separate bearing means for supporting the lever for oscillation about an axis which is transverse respecting the first axis and remote from said mounting member toward the said second handle, whereby said lever and dog are bodily movable about both axes.

2. The device of claim 1 in which the first bearing means comprises a bearing tube through which the handle lever extends, the mounting member being provided with means for the support of said tube, and a sleeve rotatable in the tube, the second and separate bearing means comprising a pintle connected with the sleeve and disposed transversely thereof and on which the handle lever is pivoted for oscillation about said pintle as well as about the axis of the sleeve.

3. The device of claim 2 in further combination with a compression spring engaged interiorly with the sleeve and having a seat against said handle lever in a position oifset from said pintle.

4. The device of claim 3 in which the sleeve has spaced notches in which portions of'the spring are disposed and an intervening strap on which the spring seats.

5. A latch structure applicable to the face of a transversely apertured door, said latch structure comprising a mounting member for attachment to said face, a hearing tube projecting from said mounting member to be received into the door aperture, a sleeve rotatable in the bearing tube, a handle lever extending through the sleeve and carrying a latch dog, means pivotally mounting the handle lever from the sleeve for oscillation upon an axis transverse respecting the sleeve, means biasing the sleeve rotatably toward a position in which said last mentioned axis is approximately upright, and means biasing the handle lever from the sleeve in one direction about said axis.

, 6. The device of claim 5 in which the means for biasing the sleeve rotatably comprises a coil spring having hooked ends for which the sleeve and tube provide anchorages.

7. The device of claim 5 in which the means for biasing the sleeve rotatably comprises a coil spring having 'hooked ends for which the sleeve and tube provide anchorages normally in registration with the anchorage of the tube supporting the bias of both ends of the spring, the sleeve being rotatable in both directions from the position in which said anchorages are in registration,

rotation in either direction causing the anchorage of the sleeve to pick up one of the hooked ends of the spring from the supporting anchorage of the tube whereby to increase the bias of the spring and to subject the sleeve to a bias tending to return it to said position.

8. For use with a relatively fixed striker plate, the device of claim 5 in which said handle lever has a socket in which said dog is movable between advanced and retracted positions, together with a spring biasing the dog outwardly respecting the handle lever, said handle lever and dog having complementary parts limiting the outward movement of the dog, the dog being yieldable toward its retracted position against the bias of said spring upon encountering the striker plate in the closing movement of the door, whereby the door is self-latching without handle lever displacement.

9. In a door latch, the combination with a handle lever provided with a bearing socket, of a dog comprising a slide reciprocable in the socket, a guide pin mounted in the handle lever and extending at least partially through the dog, the dog being relieved to provide clearance for said pin in the reciprocation of the dog and having a cavity within which said pin is exposed, and a spring having a coil provided with a connection to the dog within said cavity and having end portions one of which bears against the dog and the other of which bears against said pin.

10. The device of claim 9 in which the dog has outer,

inner and side walls and an inclined end wall of sub. stantially uniform thickness, the side walls having slots through which the pin extends and which provides said clearance, the end wall being disposed at an oblique angle between the outer and inner walls, the outer wall terminating short of the end wall whereby to provide an opening into said cavity.

11. In a door latch, a handle lever, a pintle intermediate the ends of the lever, handles mounted on the lever ends, and means supporting the pintle for pivotal movement of the handle lever, the handle lever having an enlargement adjacent one of its handles and provided within said enlargement with a cavity opening laterally of the lever, a hollow dog reciprocable in the cavity, and having opposed side walls provided with registering slots, a guide pin extending transversely of the cavity and having its ends fixed in the handle lever, said guide pin extending through the slots of the dog and serving to guide the dog and to limit its movement, a spring anchorage within the dog, a coil spring engaged with the anchorage and having projecting ends, one of which is engaged with said pin and the other with said dog under pressure biasing said dog outwardly of said cavity to the extent of dog movement permitted by said pin.

12. In a door latch adapted for mounting near the free margin of a hinged door and for cooperation with a jamb-mounted striker plate, the combination with a mounting member applicable to the door, of a pintle, means supporting the pintle from said member, a handle lever having an intermediate mounting upon said pintle, a dog mounted on the handle at the inside of the door and positioned for striker plate engagement, and a spring biasing the handle lever about said pintle in a direction to efiect dog engagement with the striker plate, the handle lever having a range of oscillation between a dog-retracting position in which the lever is substantially normal to the door, and a latched position in which the lever is positioned obliquely respecting the door and inclines toward the jamb when the dog is in striker plate engagement. I:

13. In a door latch structure adapted to be mounted near the free swinging margin of a hinged door for interaction with a jamb-mounted striker plate, the combination with a mounting member applicable to the inner face of the door and supporting a bearing, a rotor oscillatabl'el in the bearing and extending outwardly from said member, a pintle disposed transversely with respect to the axis of rotation of the rotor and mounted on the rotor to partake ofits oscillation, a handle lever pivoted on the pintle to partake of the oscillation of the rotor and to be independently oscillatable about the axis of'the pintle, and a dog mounted on the handle lever for striker plate engagement andbeing disengageable from the striker plate upon oscillation of the handle lever upon either of its axes of rotation.

14. The device of claim 13 in further combination with a slide reciprocably carried by the mounting member and provided-with an opening in which the handle lever is normally disposed andwhich has suflicient size to accommodate movement of the. handle lever upon each of. its said axes of rotation,- said slide having an extension of said opening defined by portions of. said slide spaced just sufiiciently to receive said handle lever, and the slide being movable to a position in which said spaced portions confine the handle lever against oscillative movement upon either of said axes, whereby said dog may be locked in engagement with said striker plate.

15. The device of claim 14 in which the mounting member comprises a housing having a slotted wall, the slide having a handle projecting through the slot of saidwall for manipulatioin of the slide within the housing.

16. The device of claim 15 in which the slide and mounting member have complementary portions comprising impositive detent means engageable in'the extremes of slide'movement to maintain the slide ineither' of such extremes to which it is manipulated by said handle.

17. The device of claim 15 in which the slide has detent means operable. in the extremes of. slide movement to maintain the slide in either of suchextremes to which it is manipulated by said handle, bosses oflimited-extent carried by the mounting member, the slide detent means comprising terminal flanges selectively engageable with the ends of the bosses, the slide having meansfor yieldably biasing said flanges into detent engagement with said bosses.

18. In a device of the character described, the combinationwith amounting plate and an escutcheon housingwithin which the plate is disposed, a tube projecting from said plate'in a direction outwardly of the housing, a sleeve oscillatably mounted in the tube and provided with a transverse pintle, a handle lever'piv'oted-on the pintle and extending through the sleeve, said housing and plate having registering openings through which said handle lever'extends, and a'closure for thehousing opening comprising a slide oscillatable and reciprocable within the housing and having an opening closely fitted to said lever.

19. The device of claim 18in which said closure slide has a flange closely embracing the lever and intervening between the leverand'the margins of said'housing about the opening through which the lever projects.

20. The device of claim 18 in further combination with a lock slide within the housing having an L-shaped opening with a wide portion in which the handle lever is normally disposed and a narrow portion within which the handle lever is receivable upon displacement of the lock'slide, the lock slide intervening between the mounting plate andthe housing and being provided with flanged ends for which themounting plate is provided with supporting bosse's'having' end portions and with which end portions the fianged'ends ofthelock'slide are respective ly engageable in the extreme positions of the lockslide, thelhandlelev'er being freely oscillatable about each of itsaxes'of oscillation in the wider'portionofthe opening of the lock'sli'de, and said lever being elongatedparallel to the sides 'ofthe narrow portion of said opening Whereby the handle lever isnon-oscillatable when the lock slide" 8 is manipulated to a position embracing. the handle lever in said narrow portion.

21. In a door latch structure adapted to be mounted near the free swinging margin of. a hinged door for interaction with a; jamb-mount'ed striker plate, the combination with a mounting member applicable to the inner face of the door and supporting a bearing, a rotor oscillatable in the bearing and extending outwardly from said member, a pintle disposedtransversely with respect to the axis of rotation of therotor and moun'ted'on the rotor to'partake of its oscillation; a handle lever pivoted on the pintle to partake of the oscillation of the rotor and to be independently o'scillatable aboutthe axis of the pintle, and a dog mounted on the. handle lever for striker plate engagement and being diseugageable from the striker plate upon oscillation of the handle lever upon either of its" axes of rotation, the bearing a'n'd'the rotor having normally registering spring anchorages, and a coil spring having hooked ends normally engaged under bias with opposite sides of the registering" anchorages, the bias of said ends being'normally'absorbed in the anchorage of the bearing subject to displacement upo'n oscillation of the rotor respecting' the'bearing' whereby the rotor picks up one of said ends, according to its direction of oscillation, and becomes subject to bias of said spring in a direction tending to restore it'to'said position;

22. In a door latch structure adapted to be mounted near the free swinging margin of ahinged door for interaction with a jamb-mounted striker plate, the combination with a mounting member applicable to the inner face of the door and supporting a bearing, a rotor oscillatable in the bearing and extendingoutwardly from said member, a pintle disposed transversely with respect to the axis of rotation of the rotor and mounted on the rotor to partake of its oscillation; a handle lever pivoted on the pintle to partake of the oscillation of the rotor and to be independently oscillatable about the axis of the pintle, and a dog mounted on'the handle lever for striker plate engagement and being disengageable from the striker plate upon oscillation ofthe handle lever upon either of its axes of rotation; the handle lever having a socket in which said dog'is mounted'for movement between advanced and'retracted positions,-said;dog having a'camshaped end andbeing provided with a spring biasing it toward its advanced position, said handle lever having a spring seated against the rotor and bearing against the lever'between the lever pintle'and the dog and'biasin'g the handle'lever in the same direction in which the dog' is biased by its spring.

23. In a door latch structure adapted to be mounted near the free swinging'margin ofa hinged door for interaction with a jamb-mounted striker plate, the combination with a mounting! member applicable to the inner face of the door and supporting a bearing, a rotor oscillatable in the bearing and extending outwardly from said member, a pintle disposed transversely with respect to the axis of rotation ofthe rotor and mounted on the rotor to partake of' its'o'scillation, a handle lever pivoted on the pintle to partake of'the oscillation of the rotor and to be independently oscillatable about the axis of the pintle, and a dog, mounted on the handle lever and projecting laterally in one plane of oscillation for striker. plate engagement and being disengageable from the striker plate upon oscillation of the handle leverup'on either of its axes of rotation, the handle lever haVin'gLa spring biasing it about its said pintle and 'to' aposition angularly offset at oneside' of the axis upon whichsaid rotor. is oscillatable, said" handle lever being pivotally movable about said pintle'against'the bias of said'spring away from the aforesaid position.

(References on following page) References Cited in the file of this patent UNITED STATES PATENTS Cox Apr. 2, 1907 Lohrs Mar. 3, 1936 5 Tringale Jan. 3, 1939 Anderson Feb. 4, 1941 10 Olson Feb. 23, 1943 Ledin Jan. 27, 1948 Gerson May 25, 1948 Fraim May 27, 1952 Falk Dec. 6, 1955 Quinn June 18, 1957 

